Brazil
João V gold 6400 Reis 1740-R AU Details (Environmental Damage) NGC, Rio de Janeiro mint, KM149, LMB-215. Lightly circulated, with a characteristically sea-salvaged appearance. Given its contemporary circulation and time presumably spent underwater, by all measures a storied piece!
https://coins.ha.com/itm/brazil/brazil-joao-v-gold-6400-reis-1740-r-au-details-environmental-damage-ngc-/a/3085-31244.s?type=CoinArchives3085
HID02906262019
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Estimate: 1000-1200 USD